Update beta message for 3rd 2.10 beta.
Update beta message for 3rd 2.10 beta.

hoanganhx86/SeriesGuide,0359xiaodong/SeriesGuide,UweTrottmann/SeriesGuide,r00t-user/SeriesGuide,UweTrottmann/SeriesGuide,epiphany27/SeriesGuide,artemnikitin/SeriesGuide